Quantum Key Distillation from Gaussian States by Gaussian Operations

TitleQuantum Key Distillation from Gaussian States by Gaussian Operations
Publication TypeJournal Article
Year of Publication2005
AuthorsNavascués, M, Bae, J, Cirac, IJ, Lewenstein, M, Sanpera, A, Acín, A
JournalPhysical Review Letters
Volume94
Issue1
Pagination010502
Date Published01/2005
ISSN0031-9007
Abstract

We study the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we prove that it is possible to distill a secret key secure against any attack from sufficiently entangled Gaussian states with nonpositive partial transposition. Moreover, all such states allow for key distillation, when Eve is assumed to perform finite-size coherent attacks before the reconciliation process.

URLhttp://link.aps.org/doi/10.1103/PhysRevLett.94.010502
DOI10.1103/PhysRevLett.94.010502
Campus d'excel·lència internacional U A B